After upgrading plotly.js to 2.25.0 we noticed that the legend does not get removed when deleting all traces. [Codepen](https://codepen.io/mattmoos/pen/KKrJMdG): Clicking on button removes trace but not legend entry
After upgrading plotly.js to 2.25.0 we noticed that the legend does not get removed when deleting all traces.
Codepen: Clicking on button removes trace but not legend entry